<html xmlns="http://www.w3.org/1999/xhtml">

<style id="s">
    .container {
      height: 20px;
    }
    .overflow {
      height: 30px;
    }
    body {
      width: 300px;
      -moz-column-width: 100px;
    }
  </style>
  
<body>
  <div class="container">
    <div class="overflow"></div>
  </div>
  <div class="container">
    <div class="overflow"></div>
  </div>
</body>
  
</html>
